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Not quite everything is directly connected to the ammeter circuit. It is connected to indicate generator output so that is it's main connection between generator and battery. The ignition and panel light circuits are connected through the load side of the terminal box if the 1929 service bulletin has been complied with. Horn and main lighting circuits are connected direct to the generator.
As was mentioned, if wiring had become loose or if a wire has shorted then the engine can quit. It's a good idea to check wiring every so often just to make sure all connections are tight and there is no damage to insulation in places that are sometimes problematic.
The reproduction ammeters leave a lot to be desired. I trust the old originals more.